[openssh.git] / key.c

/*
 * read_bignum():
 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
 *
 * As far as I am concerned, the code I have written for this software
 * can be used freely for any purpose.  Any derived versions of this
 * software must be clearly marked as such, and if the derived work is
 * incompatible with the protocol description in the RFC file, it must be
 * called by a name other than "ssh" or "Secure Shell".
 *
 *
 * Copyright (c) 2000 Markus Friedl.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
#include "includes.h"
RCSID("$OpenBSD: key.c,v 1.21 2001/03/11 18:29:51 markus Exp $");

#include <openssl/evp.h>

#include "xmalloc.h"
#include "key.h"
#include "rsa.h"
#include "ssh-dss.h"
#include "ssh-rsa.h"
#include "uuencode.h"
#include "buffer.h"
#include "bufaux.h"
#include "log.h"

Key *
key_new(int type)
{
	Key *k;
	RSA *rsa;
	DSA *dsa;
	k = xmalloc(sizeof(*k));
	k->type = type;
	k->dsa = NULL;
	k->rsa = NULL;
	switch (k->type) {
	case KEY_RSA1:
	case KEY_RSA:
		rsa = RSA_new();
		rsa->n = BN_new();
		rsa->e = BN_new();
		k->rsa = rsa;
		break;
	case KEY_DSA:
		dsa = DSA_new();
		dsa->p = BN_new();
		dsa->q = BN_new();
		dsa->g = BN_new();
		dsa->pub_key = BN_new();
		k->dsa = dsa;
		break;
	case KEY_UNSPEC:
		break;
	default:
		fatal("key_new: bad key type %d", k->type);
		break;
	}
	return k;
}
Key *
key_new_private(int type)
{
	Key *k = key_new(type);
	switch (k->type) {
	case KEY_RSA1:
	case KEY_RSA:
		k->rsa->d = BN_new();
		k->rsa->iqmp = BN_new();
		k->rsa->q = BN_new();
		k->rsa->p = BN_new();
		k->rsa->dmq1 = BN_new();
		k->rsa->dmp1 = BN_new();
		break;
	case KEY_DSA:
		k->dsa->priv_key = BN_new();
		break;
	case KEY_UNSPEC:
		break;
	default:
		break;
	}
	return k;
}
void
key_free(Key *k)
{
	switch (k->type) {
	case KEY_RSA1:
	case KEY_RSA:
		if (k->rsa != NULL)
			RSA_free(k->rsa);
		k->rsa = NULL;
		break;
	case KEY_DSA:
		if (k->dsa != NULL)
			DSA_free(k->dsa);
		k->dsa = NULL;
		break;
	case KEY_UNSPEC:
		break;
	default:
		fatal("key_free: bad key type %d", k->type);
		break;
	}
	xfree(k);
}
int
key_equal(Key *a, Key *b)
{
	if (a == NULL || b == NULL || a->type != b->type)
		return 0;
	switch (a->type) {
	case KEY_RSA1:
	case KEY_RSA:
		return a->rsa != NULL && b->rsa != NULL &&
		    BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
		    BN_cmp(a->rsa->n, b->rsa->n) == 0;
		break;
	case KEY_DSA:
		return a->dsa != NULL && b->dsa != NULL &&
		    BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
		    BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
		    BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
		    BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
		break;
	default:
		fatal("key_equal: bad key type %d", a->type);
		break;
	}
	return 0;
}

u_char*
key_fingerprint_raw(Key *k, enum fp_type dgst_type, size_t *dgst_raw_length)
{
	EVP_MD *md = NULL;
	EVP_MD_CTX ctx;
	u_char *blob = NULL;
	u_char *retval = NULL;
	int len = 0;
	int nlen, elen;

	*dgst_raw_length = 0;

	switch (dgst_type) {
	case SSH_FP_MD5:
		md = EVP_md5();
		break;
	case SSH_FP_SHA1:
		md = EVP_sha1();
		break;
	default:
		fatal("key_fingerprint_raw: bad digest type %d",
		    dgst_type);
	}
	switch (k->type) {
	case KEY_RSA1:
		nlen = BN_num_bytes(k->rsa->n);
		elen = BN_num_bytes(k->rsa->e);
		len = nlen + elen;
		blob = xmalloc(len);
		BN_bn2bin(k->rsa->n, blob);
		BN_bn2bin(k->rsa->e, blob + nlen);
		break;
	case KEY_DSA:
	case KEY_RSA:
		key_to_blob(k, &blob, &len);
		break;
	case KEY_UNSPEC:
		return retval;
		break;
	default:
		fatal("key_fingerprint_raw: bad key type %d", k->type);
		break;
	}
	if (blob != NULL) {
		retval = xmalloc(EVP_MAX_MD_SIZE);
		EVP_DigestInit(&ctx, md);
		EVP_DigestUpdate(&ctx, blob, len);
		EVP_DigestFinal(&ctx, retval, NULL);
		*dgst_raw_length = md->md_size;
		memset(blob, 0, len);
		xfree(blob);
	} else {
		fatal("key_fingerprint_raw: blob is null");
	}
	return retval;
}

char*
key_fingerprint_hex(u_char* dgst_raw, size_t dgst_raw_len) 
{
	char *retval;
	int i;

	retval = xmalloc(dgst_raw_len * 3);
	retval[0] = '\0';
	for(i = 0; i < dgst_raw_len; i++) {
		char hex[4];
		snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
		strlcat(retval, hex, dgst_raw_len * 3);
	}
	retval[(dgst_raw_len * 3) - 1] = '\0';
	return retval;
}

char*
key_fingerprint_bubblebabble(u_char* dgst_raw, size_t dgst_raw_len) 
{
	char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
	char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
	    'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
	u_int i, j = 0, rounds, seed = 1;
	char *retval;

	rounds = (dgst_raw_len / 2) + 1;
	retval = xmalloc(sizeof(char) * (rounds*6));
	retval[j++] = 'x';
	for (i = 0; i < rounds; i++) {
		u_int idx0, idx1, idx2, idx3, idx4;
		if ((i + 1 < rounds) || (dgst_raw_len % 2 != 0)) {
			idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
			    seed) % 6;
			idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
			idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
			    (seed / 6)) % 6;
			retval[j++] = vowels[idx0];
			retval[j++] = consonants[idx1];
			retval[j++] = vowels[idx2];
			if ((i + 1) < rounds) {
				idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
				idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
				retval[j++] = consonants[idx3];
				retval[j++] = '-';
				retval[j++] = consonants[idx4];
				seed = ((seed * 5) +
				    ((((u_int)(dgst_raw[2 * i])) * 7) +
				    ((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
			}
		} else {
			idx0 = seed % 6;
			idx1 = 16;
			idx2 = seed / 6;
			retval[j++] = vowels[idx0];
			retval[j++] = consonants[idx1];
			retval[j++] = vowels[idx2];
		}
	}
	retval[j++] = 'x';
	retval[j++] = '\0';
	return retval;
}

char*
key_fingerprint_ex(Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep)
{
	char *retval = NULL; 
	u_char *dgst_raw;
	size_t dgst_raw_len; 
	
	dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
	if (!dgst_raw)
		fatal("key_fingerprint_ex: null value returned from key_fingerprint_raw()");
	switch(dgst_rep) {
	case SSH_FP_HEX:
		retval = key_fingerprint_hex(dgst_raw, dgst_raw_len);
		break;
	case SSH_FP_BUBBLEBABBLE:
		retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
		break;
	default:
		fatal("key_fingerprint_ex: bad digest representation %d",
		    dgst_rep);
		break;
	}
	memset(dgst_raw, 0, dgst_raw_len);
	xfree(dgst_raw);
	return retval;
}

char *
key_fingerprint(Key *k)
{
	static char retval[(EVP_MAX_MD_SIZE + 1) * 3];
	char *digest;

	digest = key_fingerprint_ex(k, SSH_FP_MD5, SSH_FP_HEX);
	strlcpy(retval, digest, sizeof(retval));
	xfree(digest);
	return retval;
}

/*
 * Reads a multiple-precision integer in decimal from the buffer, and advances
 * the pointer.  The integer must already be initialized.  This function is
 * permitted to modify the buffer.  This leaves *cpp to point just beyond the
 * last processed (and maybe modified) character.  Note that this may modify
 * the buffer containing the number.
 */
int
read_bignum(char **cpp, BIGNUM * value)
{
	char *cp = *cpp;
	int old;

	/* Skip any leading whitespace. */
	for (; *cp == ' ' || *cp == '\t'; cp++)
		;

	/* Check that it begins with a decimal digit. */
	if (*cp < '0' || *cp > '9')
		return 0;

	/* Save starting position. */
	*cpp = cp;

	/* Move forward until all decimal digits skipped. */
	for (; *cp >= '0' && *cp <= '9'; cp++)
		;

	/* Save the old terminating character, and replace it by \0. */
	old = *cp;
	*cp = 0;

	/* Parse the number. */
	if (BN_dec2bn(&value, *cpp) == 0)
		return 0;

	/* Restore old terminating character. */
	*cp = old;

	/* Move beyond the number and return success. */
	*cpp = cp;
	return 1;
}
int
write_bignum(FILE *f, BIGNUM *num)
{
	char *buf = BN_bn2dec(num);
	if (buf == NULL) {
		error("write_bignum: BN_bn2dec() failed");
		return 0;
	}
	fprintf(f, " %s", buf);
	xfree(buf);
	return 1;
}

/* returns 1 ok, -1 error, 0 type mismatch */
int
key_read(Key *ret, char **cpp)
{
	Key *k;
	int success = -1;
	char *cp, *space;
	int len, n, type;
	u_int bits;
	u_char *blob;

	cp = *cpp;

	switch(ret->type) {
	case KEY_RSA1:
		/* Get number of bits. */
		if (*cp < '0' || *cp > '9')
			return -1;	/* Bad bit count... */
		for (bits = 0; *cp >= '0' && *cp <= '9'; cp++)
			bits = 10 * bits + *cp - '0';
		if (bits == 0)
			return -1;
		*cpp = cp;
		/* Get public exponent, public modulus. */
		if (!read_bignum(cpp, ret->rsa->e))
			return -1;
		if (!read_bignum(cpp, ret->rsa->n))
			return -1;
		success = 1;
		break;
	case KEY_UNSPEC:
	case KEY_RSA:
	case KEY_DSA:
		space = strchr(cp, ' ');
		if (space == NULL) {
			debug3("key_read: no space");
			return -1;
		}
		*space = '\0';
		type = key_type_from_name(cp);
		*space = ' ';
		if (type == KEY_UNSPEC) {
			debug3("key_read: no key found");
			return -1;
		}
		cp = space+1;
		if (*cp == '\0') {
			debug3("key_read: short string");
			return -1;
		}
		if (ret->type == KEY_UNSPEC) {
			ret->type = type;
		} else if (ret->type != type) {
			/* is a key, but different type */
			debug3("key_read: type mismatch");
			return 0;
		}
		len = 2*strlen(cp);
		blob = xmalloc(len);
		n = uudecode(cp, blob, len);
		if (n < 0) {
			error("key_read: uudecode %s failed", cp);
			return -1;
		}
		k = key_from_blob(blob, n);
		if (k == NULL) {
			error("key_read: key_from_blob %s failed", cp);
			return -1;
		}
		xfree(blob);
		if (k->type != type) {
			error("key_read: type mismatch: encoding error");
			key_free(k);
			return -1;
		}
/*XXXX*/
		if (ret->type == KEY_RSA) {
			if (ret->rsa != NULL)
				RSA_free(ret->rsa);
			ret->rsa = k->rsa;
			k->rsa = NULL;
			success = 1;
#ifdef DEBUG_PK
			RSA_print_fp(stderr, ret->rsa, 8);
#endif
		} else {
			if (ret->dsa != NULL)
				DSA_free(ret->dsa);
			ret->dsa = k->dsa;
			k->dsa = NULL;
			success = 1;
#ifdef DEBUG_PK
			DSA_print_fp(stderr, ret->dsa, 8);
#endif
		}
/*XXXX*/
		if (success != 1)
			break;
		key_free(k);
		/* advance cp: skip whitespace and data */
		while (*cp == ' ' || *cp == '\t')
			cp++;
		while (*cp != '\0' && *cp != ' ' && *cp != '\t')
			cp++;
		*cpp = cp;
		break;
	default:
		fatal("key_read: bad key type: %d", ret->type);
		break;
	}
	return success;
}
int
key_write(Key *key, FILE *f)
{
	int success = 0;
	u_int bits = 0;

	if (key->type == KEY_RSA1 && key->rsa != NULL) {
		/* size of modulus 'n' */
		bits = BN_num_bits(key->rsa->n);
		fprintf(f, "%u", bits);
		if (write_bignum(f, key->rsa->e) &&
		    write_bignum(f, key->rsa->n)) {
			success = 1;
		} else {
			error("key_write: failed for RSA key");
		}
	} else if ((key->type == KEY_DSA && key->dsa != NULL) ||
	    (key->type == KEY_RSA && key->rsa != NULL)) {
		int len, n;
		u_char *blob, *uu;
		key_to_blob(key, &blob, &len);
		uu = xmalloc(2*len);
		n = uuencode(blob, len, uu, 2*len);
		if (n > 0) {
			fprintf(f, "%s %s", key_ssh_name(key), uu);
			success = 1;
		}
		xfree(blob);
		xfree(uu);
	}
	return success;
}
char *
key_type(Key *k)
{
	switch (k->type) {
	case KEY_RSA1:
		return "RSA1";
		break;
	case KEY_RSA:
		return "RSA";
		break;
	case KEY_DSA:
		return "DSA";
		break;
	}
	return "unknown";
}
char *
key_ssh_name(Key *k)
{
	switch (k->type) {
	case KEY_RSA:
		return "ssh-rsa";
		break;
	case KEY_DSA:
		return "ssh-dss";
		break;
	}
	return "ssh-unknown";
}
u_int
key_size(Key *k){
	switch (k->type) {
	case KEY_RSA1:
	case KEY_RSA:
		return BN_num_bits(k->rsa->n);
		break;
	case KEY_DSA:
		return BN_num_bits(k->dsa->p);
		break;
	}
	return 0;
}

RSA *
rsa_generate_private_key(u_int bits)
{
	RSA *private;
	private = RSA_generate_key(bits, 35, NULL, NULL);
	if (private == NULL)
		fatal("rsa_generate_private_key: key generation failed.");
	return private;
}

DSA*
dsa_generate_private_key(u_int bits)
{
	DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL);
	if (private == NULL)
		fatal("dsa_generate_private_key: DSA_generate_parameters failed");
	if (!DSA_generate_key(private))
		fatal("dsa_generate_private_key: DSA_generate_key failed.");
	if (private == NULL)
		fatal("dsa_generate_private_key: NULL.");
	return private;
}

Key *
key_generate(int type, u_int bits)
{
	Key *k = key_new(KEY_UNSPEC);
	switch (type) {
	case KEY_DSA:
		k->dsa = dsa_generate_private_key(bits);
		break;
	case KEY_RSA:
	case KEY_RSA1:
		k->rsa = rsa_generate_private_key(bits);
		break;
	default:
		fatal("key_generate: unknown type %d", type);
	}
	k->type = type;
	return k;
}

Key *
key_from_private(Key *k)
{
	Key *n = NULL;
	switch (k->type) {
	case KEY_DSA:
		n = key_new(k->type);
		BN_copy(n->dsa->p, k->dsa->p);
		BN_copy(n->dsa->q, k->dsa->q);
		BN_copy(n->dsa->g, k->dsa->g);
		BN_copy(n->dsa->pub_key, k->dsa->pub_key);
		break;
	case KEY_RSA:
	case KEY_RSA1:
		n = key_new(k->type);
		BN_copy(n->rsa->n, k->rsa->n);
		BN_copy(n->rsa->e, k->rsa->e);
		break;
	default:
		fatal("key_from_private: unknown type %d", k->type);
		break;
	}
	return n;
}

int
key_type_from_name(char *name)
{
	if (strcmp(name, "rsa1") == 0){
		return KEY_RSA1;
	} else if (strcmp(name, "rsa") == 0){
		return KEY_RSA;
	} else if (strcmp(name, "dsa") == 0){
		return KEY_DSA;
	} else if (strcmp(name, "ssh-rsa") == 0){
		return KEY_RSA;
	} else if (strcmp(name, "ssh-dss") == 0){
		return KEY_DSA;
	}
	debug2("key_type_from_name: unknown key type '%s'", name);
	return KEY_UNSPEC;
}

Key *
key_from_blob(char *blob, int blen)
{
	Buffer b;
	char *ktype;
	int rlen, type;
	Key *key = NULL;

#ifdef DEBUG_PK
	dump_base64(stderr, blob, blen);
#endif
	buffer_init(&b);
	buffer_append(&b, blob, blen);
	ktype = buffer_get_string(&b, NULL);
	type = key_type_from_name(ktype);

	switch(type){
	case KEY_RSA:
		key = key_new(type);
		buffer_get_bignum2(&b, key->rsa->e);
		buffer_get_bignum2(&b, key->rsa->n);
#ifdef DEBUG_PK
		RSA_print_fp(stderr, key->rsa, 8);
#endif
		break;
	case KEY_DSA:
		key = key_new(type);
		buffer_get_bignum2(&b, key->dsa->p);
		buffer_get_bignum2(&b, key->dsa->q);
		buffer_get_bignum2(&b, key->dsa->g);
		buffer_get_bignum2(&b, key->dsa->pub_key);
#ifdef DEBUG_PK
		DSA_print_fp(stderr, key->dsa, 8);
#endif
		break;
	case KEY_UNSPEC:
		key = key_new(type);
		break;
	default:
		error("key_from_blob: cannot handle type %s", ktype);
		break;
	}
	rlen = buffer_len(&b);
	if (key != NULL && rlen != 0)
		error("key_from_blob: remaining bytes in key blob %d", rlen);
	xfree(ktype);
	buffer_free(&b);
	return key;
}

int
key_to_blob(Key *key, u_char **blobp, u_int *lenp)
{
	Buffer b;
	int len;
	u_char *buf;

	if (key == NULL) {
		error("key_to_blob: key == NULL");
		return 0;
	}
	buffer_init(&b);
	switch(key->type){
	case KEY_DSA:
		buffer_put_cstring(&b, key_ssh_name(key));
		buffer_put_bignum2(&b, key->dsa->p);
		buffer_put_bignum2(&b, key->dsa->q);
		buffer_put_bignum2(&b, key->dsa->g);
		buffer_put_bignum2(&b, key->dsa->pub_key);
		break;
	case KEY_RSA:
		buffer_put_cstring(&b, key_ssh_name(key));
		buffer_put_bignum2(&b, key->rsa->e);
		buffer_put_bignum2(&b, key->rsa->n);
		break;
	default:
		error("key_to_blob: illegal key type %d", key->type);
		break;
	}
	len = buffer_len(&b);
	buf = xmalloc(len);
	memcpy(buf, buffer_ptr(&b), len);
	memset(buffer_ptr(&b), 0, len);
	buffer_free(&b);
	if (lenp != NULL)
		*lenp = len;
	if (blobp != NULL)
		*blobp = buf;
	return len;
}

int
key_sign(
    Key *key,
    u_char **sigp, int *lenp,
    u_char *data, int datalen)
{
	switch(key->type){
	case KEY_DSA:
		return ssh_dss_sign(key, sigp, lenp, data, datalen);
		break;
	case KEY_RSA:
		return ssh_rsa_sign(key, sigp, lenp, data, datalen);
		break;
	default:
		error("key_sign: illegal key type %d", key->type);
		return -1;
		break;
	}
}

int
key_verify(
    Key *key,
    u_char *signature, int signaturelen,
    u_char *data, int datalen)
{
	switch(key->type){
	case KEY_DSA:
		return ssh_dss_verify(key, signature, signaturelen, data, datalen);
		break;
	case KEY_RSA:
		return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
		break;
	default:
		error("key_verify: illegal key type %d", key->type);
		return -1;
		break;
	}
}
Commit	Line	Data
4fe2af09	1	/*
bcbf86ec	2	* read_bignum():
	3	* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
	4	*
	5	* As far as I am concerned, the code I have written for this software
	6	* can be used freely for any purpose. Any derived versions of this
	7	* software must be clearly marked as such, and if the derived work is
	8	* incompatible with the protocol description in the RFC file, it must be
	9	* called by a name other than "ssh" or "Secure Shell".
	10	*
	11	*
4fe2af09	12	* Copyright (c) 2000 Markus Friedl. All rights reserved.
	13	*
	14	* Redistribution and use in source and binary forms, with or without
	15	* modification, are permitted provided that the following conditions
	16	* are met:
	17	* 1. Redistributions of source code must retain the above copyright
	18	* notice, this list of conditions and the following disclaimer.
	19	* 2. Redistributions in binary form must reproduce the above copyright
	20	* notice, this list of conditions and the following disclaimer in the
	21	* documentation and/or other materials provided with the distribution.
4fe2af09	22	*
	23	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
	24	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
	25	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
	26	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
	27	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	28	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	29	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	30	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	31	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	32	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	33	*/
4fe2af09	34	#include "includes.h"
79c9ac1b	35	RCSID("$OpenBSD: key.c,v 1.21 2001/03/11 18:29:51 markus Exp $");
42f11eb2	36
4fe2af09	37	#include <openssl/evp.h>
42f11eb2	38
4fe2af09	39	#include "xmalloc.h"
4fe2af09	40	#include "key.h"
fa08c86b	41	#include "rsa.h"
	42	#include "ssh-dss.h"
	43	#include "ssh-rsa.h"
a306f2dd	44	#include "uuencode.h"
fa08c86b	45	#include "buffer.h"
fa08c86b	46	#include "bufaux.h"
42f11eb2	47	#include "log.h"
4fe2af09	48
	49	Key *
	50	key_new(int type)
	51	{
	52	Key *k;
	53	RSA *rsa;
	54	DSA *dsa;
	55	k = xmalloc(sizeof(*k));
	56	k->type = type;
a306f2dd	57	k->dsa = NULL;
a306f2dd	58	k->rsa = NULL;
4fe2af09	59	switch (k->type) {
fa08c86b	60	case KEY_RSA1:
4fe2af09	61	case KEY_RSA:
	62	rsa = RSA_new();
	63	rsa->n = BN_new();
	64	rsa->e = BN_new();
	65	k->rsa = rsa;
	66	break;
	67	case KEY_DSA:
	68	dsa = DSA_new();
	69	dsa->p = BN_new();
	70	dsa->q = BN_new();
	71	dsa->g = BN_new();
	72	dsa->pub_key = BN_new();
	73	k->dsa = dsa;
	74	break;
fa08c86b	75	case KEY_UNSPEC:
4fe2af09	76	break;
	77	default:
	78	fatal("key_new: bad key type %d", k->type);
	79	break;
	80	}
	81	return k;
	82	}
fa08c86b	83	Key *
	84	key_new_private(int type)
	85	{
	86	Key *k = key_new(type);
	87	switch (k->type) {
	88	case KEY_RSA1:
	89	case KEY_RSA:
	90	k->rsa->d = BN_new();
	91	k->rsa->iqmp = BN_new();
	92	k->rsa->q = BN_new();
	93	k->rsa->p = BN_new();
	94	k->rsa->dmq1 = BN_new();
	95	k->rsa->dmp1 = BN_new();
	96	break;
	97	case KEY_DSA:
	98	k->dsa->priv_key = BN_new();
	99	break;
	100	case KEY_UNSPEC:
	101	break;
	102	default:
	103	break;
	104	}
	105	return k;
	106	}
4fe2af09	107	void
	108	key_free(Key *k)
	109	{
	110	switch (k->type) {
fa08c86b	111	case KEY_RSA1:
4fe2af09	112	case KEY_RSA:
	113	if (k->rsa != NULL)
	114	RSA_free(k->rsa);
	115	k->rsa = NULL;
	116	break;
	117	case KEY_DSA:
	118	if (k->dsa != NULL)
	119	DSA_free(k->dsa);
	120	k->dsa = NULL;
	121	break;
fa08c86b	122	case KEY_UNSPEC:
fa08c86b	123	break;
4fe2af09	124	default:
	125	fatal("key_free: bad key type %d", k->type);
	126	break;
	127	}
	128	xfree(k);
	129	}
	130	int
	131	key_equal(Key a, Key b)
	132	{
	133	if (a == NULL \|\| b == NULL \|\| a->type != b->type)
	134	return 0;
	135	switch (a->type) {
fa08c86b	136	case KEY_RSA1:
4fe2af09	137	case KEY_RSA:
	138	return a->rsa != NULL && b->rsa != NULL &&
	139	BN_cmp(a->rsa->e, b->rsa->e) == 0 &&
	140	BN_cmp(a->rsa->n, b->rsa->n) == 0;
	141	break;
	142	case KEY_DSA:
	143	return a->dsa != NULL && b->dsa != NULL &&
	144	BN_cmp(a->dsa->p, b->dsa->p) == 0 &&
	145	BN_cmp(a->dsa->q, b->dsa->q) == 0 &&
	146	BN_cmp(a->dsa->g, b->dsa->g) == 0 &&
	147	BN_cmp(a->dsa->pub_key, b->dsa->pub_key) == 0;
	148	break;
	149	default:
a306f2dd	150	fatal("key_equal: bad key type %d", a->type);
4fe2af09	151	break;
	152	}
	153	return 0;
	154	}
	155
301e8e5b	156	u_char*
301e8e5b	157	key_fingerprint_raw(Key k, enum fp_type dgst_type, size_t dgst_raw_length)
4fe2af09	158	{
79c9ac1b	159	EVP_MD *md = NULL;
79c9ac1b	160	EVP_MD_CTX ctx;
1e3b8b07	161	u_char *blob = NULL;
301e8e5b	162	u_char *retval = NULL;
4fe2af09	163	int len = 0;
a306f2dd	164	int nlen, elen;
4fe2af09	165
301e8e5b	166	*dgst_raw_length = 0;
301e8e5b	167
79c9ac1b	168	switch (dgst_type) {
	169	case SSH_FP_MD5:
	170	md = EVP_md5();
	171	break;
	172	case SSH_FP_SHA1:
	173	md = EVP_sha1();
	174	break;
	175	default:
	176	fatal("key_fingerprint_raw: bad digest type %d",
	177	dgst_type);
	178	}
4fe2af09	179	switch (k->type) {
fa08c86b	180	case KEY_RSA1:
4fe2af09	181	nlen = BN_num_bytes(k->rsa->n);
	182	elen = BN_num_bytes(k->rsa->e);
	183	len = nlen + elen;
a306f2dd	184	blob = xmalloc(len);
	185	BN_bn2bin(k->rsa->n, blob);
	186	BN_bn2bin(k->rsa->e, blob + nlen);
4fe2af09	187	break;
4fe2af09	188	case KEY_DSA:
fa08c86b	189	case KEY_RSA:
	190	key_to_blob(k, &blob, &len);
	191	break;
	192	case KEY_UNSPEC:
	193	return retval;
4fe2af09	194	break;
4fe2af09	195	default:
301e8e5b	196	fatal("key_fingerprint_raw: bad key type %d", k->type);
4fe2af09	197	break;
4fe2af09	198	}
a306f2dd	199	if (blob != NULL) {
301e8e5b	200	retval = xmalloc(EVP_MAX_MD_SIZE);
74fc9186	201	EVP_DigestInit(&ctx, md);
74fc9186	202	EVP_DigestUpdate(&ctx, blob, len);
301e8e5b	203	EVP_DigestFinal(&ctx, retval, NULL);
301e8e5b	204	*dgst_raw_length = md->md_size;
a306f2dd	205	memset(blob, 0, len);
a306f2dd	206	xfree(blob);
301e8e5b	207	} else {
301e8e5b	208	fatal("key_fingerprint_raw: blob is null");
4fe2af09	209	}
	210	return retval;
	211	}
	212
301e8e5b	213	char*
	214	key_fingerprint_hex(u_char* dgst_raw, size_t dgst_raw_len)
	215	{
	216	char *retval;
	217	int i;
	218
	219	retval = xmalloc(dgst_raw_len * 3);
	220	retval[0] = '\0';
	221	for(i = 0; i < dgst_raw_len; i++) {
	222	char hex[4];
	223	snprintf(hex, sizeof(hex), "%02x:", dgst_raw[i]);
	224	strlcat(retval, hex, dgst_raw_len * 3);
	225	}
	226	retval[(dgst_raw_len * 3) - 1] = '\0';
	227	return retval;
	228	}
	229
	230	char*
	231	key_fingerprint_bubblebabble(u_char* dgst_raw, size_t dgst_raw_len)
	232	{
	233	char vowels[] = { 'a', 'e', 'i', 'o', 'u', 'y' };
	234	char consonants[] = { 'b', 'c', 'd', 'f', 'g', 'h', 'k', 'l', 'm',
	235	'n', 'p', 'r', 's', 't', 'v', 'z', 'x' };
08345971	236	u_int i, j = 0, rounds, seed = 1;
301e8e5b	237	char *retval;
	238
	239	rounds = (dgst_raw_len / 2) + 1;
	240	retval = xmalloc(sizeof(char) * (rounds*6));
08345971	241	retval[j++] = 'x';
08345971	242	for (i = 0; i < rounds; i++) {
301e8e5b	243	u_int idx0, idx1, idx2, idx3, idx4;
08345971	244	if ((i + 1 < rounds) \|\| (dgst_raw_len % 2 != 0)) {
08345971	245	idx0 = (((((u_int)(dgst_raw[2 * i])) >> 6) & 3) +
301e8e5b	246	seed) % 6;
08345971	247	idx1 = (((u_int)(dgst_raw[2 * i])) >> 2) & 15;
08345971	248	idx2 = ((((u_int)(dgst_raw[2 * i])) & 3) +
301e8e5b	249	(seed / 6)) % 6;
08345971	250	retval[j++] = vowels[idx0];
	251	retval[j++] = consonants[idx1];
	252	retval[j++] = vowels[idx2];
	253	if ((i + 1) < rounds) {
	254	idx3 = (((u_int)(dgst_raw[(2 * i) + 1])) >> 4) & 15;
	255	idx4 = (((u_int)(dgst_raw[(2 * i) + 1]))) & 15;
	256	retval[j++] = consonants[idx3];
	257	retval[j++] = '-';
	258	retval[j++] = consonants[idx4];
301e8e5b	259	seed = ((seed * 5) +
08345971	260	((((u_int)(dgst_raw[2 * i])) * 7) +
08345971	261	((u_int)(dgst_raw[(2 * i) + 1])))) % 36;
301e8e5b	262	}
	263	} else {
	264	idx0 = seed % 6;
	265	idx1 = 16;
	266	idx2 = seed / 6;
08345971	267	retval[j++] = vowels[idx0];
	268	retval[j++] = consonants[idx1];
	269	retval[j++] = vowels[idx2];
301e8e5b	270	}
301e8e5b	271	}
08345971	272	retval[j++] = 'x';
08345971	273	retval[j++] = '\0';
301e8e5b	274	return retval;
	275	}
	276
	277	char*
	278	key_fingerprint_ex(Key *k, enum fp_type dgst_type, enum fp_rep dgst_rep)
	279	{
	280	char *retval = NULL;
	281	u_char *dgst_raw;
	282	size_t dgst_raw_len;
	283
	284	dgst_raw = key_fingerprint_raw(k, dgst_type, &dgst_raw_len);
	285	if (!dgst_raw)
	286	fatal("key_fingerprint_ex: null value returned from key_fingerprint_raw()");
	287	switch(dgst_rep) {
	288	case SSH_FP_HEX:
	289	retval = key_fingerprint_hex(dgst_raw, dgst_raw_len);
	290	break;
	291	case SSH_FP_BUBBLEBABBLE:
	292	retval = key_fingerprint_bubblebabble(dgst_raw, dgst_raw_len);
	293	break;
	294	default:
	295	fatal("key_fingerprint_ex: bad digest representation %d",
	296	dgst_rep);
	297	break;
	298	}
	299	memset(dgst_raw, 0, dgst_raw_len);
	300	xfree(dgst_raw);
	301	return retval;
	302	}
	303
	304	char *
	305	key_fingerprint(Key *k)
	306	{
	307	static char retval[(EVP_MAX_MD_SIZE + 1) * 3];
	308	char *digest;
	309
	310	digest = key_fingerprint_ex(k, SSH_FP_MD5, SSH_FP_HEX);
	311	strlcpy(retval, digest, sizeof(retval));
	312	xfree(digest);
	313	return retval;
	314	}
	315
4fe2af09	316	/*
	317	* Reads a multiple-precision integer in decimal from the buffer, and advances
	318	* the pointer. The integer must already be initialized. This function is
	319	* permitted to modify the buffer. This leaves *cpp to point just beyond the
	320	* last processed (and maybe modified) character. Note that this may modify
	321	* the buffer containing the number.
	322	*/
	323	int
	324	read_bignum(char *cpp, BIGNUM value)
	325	{
	326	char cp = cpp;
	327	int old;
	328
	329	/* Skip any leading whitespace. */
	330	for (; cp == ' ' \|\| cp == '\t'; cp++)
	331	;
	332
	333	/* Check that it begins with a decimal digit. */
	334	if (cp < '0' \|\| cp > '9')
	335	return 0;
	336
	337	/* Save starting position. */
	338	*cpp = cp;
	339
	340	/* Move forward until all decimal digits skipped. */
	341	for (; cp >= '0' && cp <= '9'; cp++)
	342	;
	343
	344	/* Save the old terminating character, and replace it by \0. */
	345	old = *cp;
	346	*cp = 0;
	347
	348	/* Parse the number. */
	349	if (BN_dec2bn(&value, *cpp) == 0)
	350	return 0;
	351
	352	/* Restore old terminating character. */
	353	*cp = old;
	354
	355	/* Move beyond the number and return success. */
	356	*cpp = cp;
	357	return 1;
	358	}
	359	int
	360	write_bignum(FILE f, BIGNUM num)
	361	{
	362	char *buf = BN_bn2dec(num);
	363	if (buf == NULL) {
	364	error("write_bignum: BN_bn2dec() failed");
	365	return 0;
	366	}
	367	fprintf(f, " %s", buf);
53a24016	368	xfree(buf);
4fe2af09	369	return 1;
4fe2af09	370	}
fa08c86b	371
	372	/* returns 1 ok, -1 error, 0 type mismatch */
	373	int
a306f2dd	374	key_read(Key ret, char *cpp)
4fe2af09	375	{
a306f2dd	376	Key *k;
fa08c86b	377	int success = -1;
	378	char cp, space;
	379	int len, n, type;
	380	u_int bits;
1e3b8b07	381	u_char *blob;
a306f2dd	382
	383	cp = *cpp;
	384
4fe2af09	385	switch(ret->type) {
fa08c86b	386	case KEY_RSA1:
a306f2dd	387	/* Get number of bits. */
a306f2dd	388	if (cp < '0' \|\| cp > '9')
fa08c86b	389	return -1; /* Bad bit count... */
a306f2dd	390	for (bits = 0; cp >= '0' && cp <= '9'; cp++)
a306f2dd	391	bits = 10 * bits + *cp - '0';
4fe2af09	392	if (bits == 0)
fa08c86b	393	return -1;
a306f2dd	394	*cpp = cp;
4fe2af09	395	/* Get public exponent, public modulus. */
4fe2af09	396	if (!read_bignum(cpp, ret->rsa->e))
fa08c86b	397	return -1;
4fe2af09	398	if (!read_bignum(cpp, ret->rsa->n))
fa08c86b	399	return -1;
fa08c86b	400	success = 1;
4fe2af09	401	break;
fa08c86b	402	case KEY_UNSPEC:
fa08c86b	403	case KEY_RSA:
4fe2af09	404	case KEY_DSA:
fa08c86b	405	space = strchr(cp, ' ');
	406	if (space == NULL) {
	407	debug3("key_read: no space");
	408	return -1;
	409	}
	410	*space = '\0';
	411	type = key_type_from_name(cp);
	412	*space = ' ';
	413	if (type == KEY_UNSPEC) {
	414	debug3("key_read: no key found");
	415	return -1;
	416	}
	417	cp = space+1;
	418	if (*cp == '\0') {
	419	debug3("key_read: short string");
	420	return -1;
	421	}
	422	if (ret->type == KEY_UNSPEC) {
	423	ret->type = type;
	424	} else if (ret->type != type) {
	425	/* is a key, but different type */
	426	debug3("key_read: type mismatch");
4fe2af09	427	return 0;
fa08c86b	428	}
a306f2dd	429	len = 2*strlen(cp);
	430	blob = xmalloc(len);
	431	n = uudecode(cp, blob, len);
1d1ffb87	432	if (n < 0) {
71276795	433	error("key_read: uudecode %s failed", cp);
fa08c86b	434	return -1;
1d1ffb87	435	}
fa08c86b	436	k = key_from_blob(blob, n);
71276795	437	if (k == NULL) {
fa08c86b	438	error("key_read: key_from_blob %s failed", cp);
fa08c86b	439	return -1;
71276795	440	}
a306f2dd	441	xfree(blob);
fa08c86b	442	if (k->type != type) {
	443	error("key_read: type mismatch: encoding error");
	444	key_free(k);
	445	return -1;
	446	}
	447	/XXXX/
	448	if (ret->type == KEY_RSA) {
	449	if (ret->rsa != NULL)
	450	RSA_free(ret->rsa);
	451	ret->rsa = k->rsa;
	452	k->rsa = NULL;
	453	success = 1;
	454	#ifdef DEBUG_PK
	455	RSA_print_fp(stderr, ret->rsa, 8);
	456	#endif
	457	} else {
	458	if (ret->dsa != NULL)
	459	DSA_free(ret->dsa);
	460	ret->dsa = k->dsa;
	461	k->dsa = NULL;
	462	success = 1;
	463	#ifdef DEBUG_PK
	464	DSA_print_fp(stderr, ret->dsa, 8);
	465	#endif
	466	}
	467	/XXXX/
	468	if (success != 1)
	469	break;
a306f2dd	470	key_free(k);
71276795	471	/* advance cp: skip whitespace and data */
	472	while (cp == ' ' \|\| cp == '\t')
	473	cp++;
	474	while (cp != '\0' && cp != ' ' && *cp != '\t')
	475	cp++;
	476	*cpp = cp;
4fe2af09	477	break;
4fe2af09	478	default:
a306f2dd	479	fatal("key_read: bad key type: %d", ret->type);
4fe2af09	480	break;
4fe2af09	481	}
fa08c86b	482	return success;
4fe2af09	483	}
	484	int
	485	key_write(Key key, FILE f)
	486	{
	487	int success = 0;
1e3b8b07	488	u_int bits = 0;
4fe2af09	489
fa08c86b	490	if (key->type == KEY_RSA1 && key->rsa != NULL) {
4fe2af09	491	/* size of modulus 'n' */
	492	bits = BN_num_bits(key->rsa->n);
	493	fprintf(f, "%u", bits);
	494	if (write_bignum(f, key->rsa->e) &&
	495	write_bignum(f, key->rsa->n)) {
	496	success = 1;
	497	} else {
	498	error("key_write: failed for RSA key");
	499	}
fa08c86b	500	} else if ((key->type == KEY_DSA && key->dsa != NULL) \|\|
fa08c86b	501	(key->type == KEY_RSA && key->rsa != NULL)) {
a306f2dd	502	int len, n;
1e3b8b07	503	u_char blob, uu;
fa08c86b	504	key_to_blob(key, &blob, &len);
a306f2dd	505	uu = xmalloc(2*len);
1d1ffb87	506	n = uuencode(blob, len, uu, 2*len);
1d1ffb87	507	if (n > 0) {
fa08c86b	508	fprintf(f, "%s %s", key_ssh_name(key), uu);
1d1ffb87	509	success = 1;
1d1ffb87	510	}
a306f2dd	511	xfree(blob);
a306f2dd	512	xfree(uu);
4fe2af09	513	}
	514	return success;
	515	}
1d1ffb87	516	char *
	517	key_type(Key *k)
	518	{
	519	switch (k->type) {
fa08c86b	520	case KEY_RSA1:
	521	return "RSA1";
	522	break;
1d1ffb87	523	case KEY_RSA:
	524	return "RSA";
	525	break;
	526	case KEY_DSA:
	527	return "DSA";
	528	break;
	529	}
	530	return "unknown";
	531	}
fa08c86b	532	char *
	533	key_ssh_name(Key *k)
	534	{
	535	switch (k->type) {
	536	case KEY_RSA:
	537	return "ssh-rsa";
	538	break;
	539	case KEY_DSA:
	540	return "ssh-dss";
	541	break;
	542	}
	543	return "ssh-unknown";
	544	}
	545	u_int
2e73a022	546	key_size(Key *k){
2e73a022	547	switch (k->type) {
fa08c86b	548	case KEY_RSA1:
2e73a022	549	case KEY_RSA:
	550	return BN_num_bits(k->rsa->n);
	551	break;
	552	case KEY_DSA:
	553	return BN_num_bits(k->dsa->p);
	554	break;
	555	}
	556	return 0;
	557	}
fa08c86b	558
fa08c86b	559	RSA *
1e3b8b07	560	rsa_generate_private_key(u_int bits)
fa08c86b	561	{
2b87da3b	562	RSA *private;
	563	private = RSA_generate_key(bits, 35, NULL, NULL);
	564	if (private == NULL)
	565	fatal("rsa_generate_private_key: key generation failed.");
	566	return private;
fa08c86b	567	}
	568
	569	DSA*
1e3b8b07	570	dsa_generate_private_key(u_int bits)
fa08c86b	571	{
	572	DSA *private = DSA_generate_parameters(bits, NULL, 0, NULL, NULL, NULL, NULL);
	573	if (private == NULL)
	574	fatal("dsa_generate_private_key: DSA_generate_parameters failed");
	575	if (!DSA_generate_key(private))
2b87da3b	576	fatal("dsa_generate_private_key: DSA_generate_key failed.");
	577	if (private == NULL)
	578	fatal("dsa_generate_private_key: NULL.");
fa08c86b	579	return private;
	580	}
	581
	582	Key *
1e3b8b07	583	key_generate(int type, u_int bits)
fa08c86b	584	{
	585	Key *k = key_new(KEY_UNSPEC);
	586	switch (type) {
2b87da3b	587	case KEY_DSA:
fa08c86b	588	k->dsa = dsa_generate_private_key(bits);
	589	break;
	590	case KEY_RSA:
	591	case KEY_RSA1:
	592	k->rsa = rsa_generate_private_key(bits);
	593	break;
	594	default:
2b87da3b	595	fatal("key_generate: unknown type %d", type);
fa08c86b	596	}
2b87da3b	597	k->type = type;
fa08c86b	598	return k;
	599	}
	600
	601	Key *
	602	key_from_private(Key *k)
	603	{
	604	Key *n = NULL;
	605	switch (k->type) {
2b87da3b	606	case KEY_DSA:
fa08c86b	607	n = key_new(k->type);
	608	BN_copy(n->dsa->p, k->dsa->p);
	609	BN_copy(n->dsa->q, k->dsa->q);
	610	BN_copy(n->dsa->g, k->dsa->g);
	611	BN_copy(n->dsa->pub_key, k->dsa->pub_key);
	612	break;
	613	case KEY_RSA:
	614	case KEY_RSA1:
	615	n = key_new(k->type);
	616	BN_copy(n->rsa->n, k->rsa->n);
	617	BN_copy(n->rsa->e, k->rsa->e);
	618	break;
	619	default:
2b87da3b	620	fatal("key_from_private: unknown type %d", k->type);
fa08c86b	621	break;
	622	}
	623	return n;
	624	}
	625
	626	int
	627	key_type_from_name(char *name)
	628	{
	629	if (strcmp(name, "rsa1") == 0){
	630	return KEY_RSA1;
	631	} else if (strcmp(name, "rsa") == 0){
	632	return KEY_RSA;
	633	} else if (strcmp(name, "dsa") == 0){
	634	return KEY_DSA;
	635	} else if (strcmp(name, "ssh-rsa") == 0){
	636	return KEY_RSA;
	637	} else if (strcmp(name, "ssh-dss") == 0){
	638	return KEY_DSA;
	639	}
539af7f5	640	debug2("key_type_from_name: unknown key type '%s'", name);
fa08c86b	641	return KEY_UNSPEC;
	642	}
	643
	644	Key *
	645	key_from_blob(char *blob, int blen)
	646	{
	647	Buffer b;
	648	char *ktype;
	649	int rlen, type;
	650	Key *key = NULL;
	651
	652	#ifdef DEBUG_PK
	653	dump_base64(stderr, blob, blen);
	654	#endif
	655	buffer_init(&b);
	656	buffer_append(&b, blob, blen);
	657	ktype = buffer_get_string(&b, NULL);
	658	type = key_type_from_name(ktype);
	659
	660	switch(type){
	661	case KEY_RSA:
	662	key = key_new(type);
fa08c86b	663	buffer_get_bignum2(&b, key->rsa->e);
b5c334cc	664	buffer_get_bignum2(&b, key->rsa->n);
fa08c86b	665	#ifdef DEBUG_PK
	666	RSA_print_fp(stderr, key->rsa, 8);
	667	#endif
	668	break;
	669	case KEY_DSA:
	670	key = key_new(type);
	671	buffer_get_bignum2(&b, key->dsa->p);
	672	buffer_get_bignum2(&b, key->dsa->q);
	673	buffer_get_bignum2(&b, key->dsa->g);
	674	buffer_get_bignum2(&b, key->dsa->pub_key);
	675	#ifdef DEBUG_PK
	676	DSA_print_fp(stderr, key->dsa, 8);
	677	#endif
	678	break;
	679	case KEY_UNSPEC:
	680	key = key_new(type);
	681	break;
	682	default:
	683	error("key_from_blob: cannot handle type %s", ktype);
	684	break;
	685	}
	686	rlen = buffer_len(&b);
	687	if (key != NULL && rlen != 0)
	688	error("key_from_blob: remaining bytes in key blob %d", rlen);
	689	xfree(ktype);
	690	buffer_free(&b);
	691	return key;
	692	}
	693
	694	int
1e3b8b07	695	key_to_blob(Key key, u_char blobp, u_int lenp)
fa08c86b	696	{
	697	Buffer b;
	698	int len;
1e3b8b07	699	u_char *buf;
fa08c86b	700
	701	if (key == NULL) {
	702	error("key_to_blob: key == NULL");
	703	return 0;
	704	}
	705	buffer_init(&b);
	706	switch(key->type){
	707	case KEY_DSA:
	708	buffer_put_cstring(&b, key_ssh_name(key));
	709	buffer_put_bignum2(&b, key->dsa->p);
	710	buffer_put_bignum2(&b, key->dsa->q);
	711	buffer_put_bignum2(&b, key->dsa->g);
	712	buffer_put_bignum2(&b, key->dsa->pub_key);
	713	break;
	714	case KEY_RSA:
	715	buffer_put_cstring(&b, key_ssh_name(key));
fa08c86b	716	buffer_put_bignum2(&b, key->rsa->e);
b5c334cc	717	buffer_put_bignum2(&b, key->rsa->n);
fa08c86b	718	break;
	719	default:
	720	error("key_to_blob: illegal key type %d", key->type);
	721	break;
	722	}
	723	len = buffer_len(&b);
	724	buf = xmalloc(len);
	725	memcpy(buf, buffer_ptr(&b), len);
	726	memset(buffer_ptr(&b), 0, len);
	727	buffer_free(&b);
	728	if (lenp != NULL)
	729	*lenp = len;
	730	if (blobp != NULL)
	731	*blobp = buf;
	732	return len;
	733	}
	734
	735	int
	736	key_sign(
	737	Key *key,
1e3b8b07	738	u_char *sigp, int lenp,
1e3b8b07	739	u_char *data, int datalen)
fa08c86b	740	{
	741	switch(key->type){
	742	case KEY_DSA:
	743	return ssh_dss_sign(key, sigp, lenp, data, datalen);
	744	break;
	745	case KEY_RSA:
	746	return ssh_rsa_sign(key, sigp, lenp, data, datalen);
	747	break;
	748	default:
	749	error("key_sign: illegal key type %d", key->type);
	750	return -1;
	751	break;
	752	}
	753	}
	754
	755	int
	756	key_verify(
	757	Key *key,
1e3b8b07	758	u_char *signature, int signaturelen,
1e3b8b07	759	u_char *data, int datalen)
fa08c86b	760	{
	761	switch(key->type){
	762	case KEY_DSA:
	763	return ssh_dss_verify(key, signature, signaturelen, data, datalen);
	764	break;
	765	case KEY_RSA:
	766	return ssh_rsa_verify(key, signature, signaturelen, data, datalen);
	767	break;
	768	default:
	769	error("key_verify: illegal key type %d", key->type);
	770	return -1;
	771	break;
	772	}
	773	}